	<!-- 演示地址以及主图上传 -->
	<div class="form-group row" id="yan">

		<div class="col-sm-4  custom-file" style="margin-left: 22px">
				<input  type="file" id="img_upload" class=" custom-file-input " name="zhutu_url"  style="margin-top:-1px;display: inline-block;">
				<label class=" custom-file-label">上传封面图片</label> 
		</div>	
		<div class="col-sm-6  custom-file">
			<input type="text" id="image" placeholder="封面地址-可手动输入"  name="image" 
			value="<?php if(!empty($thread['image']))  echo $thread['image'] ; ?>">
		</div>
	</div>
